Process of making wood-pulp.



No. 659,!84. Patented Oct. 2, I900. A. D. SCHAEFFER. PROCESS OF MAKING WOOD PULP.

(Application filed. Aug. 8, 1900;)"

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ARTHUR D. SCHAEFFER, OF HARTFORD CITY, INDIANA, ASSIGNORTO PIERCE M. SCHAEFFER, OF SAME PLACE.

PROCESS OF MAKING WOOD-PULP.

SPECIFICATION forming part of Letters Patent No. 659,184, d t d O t b 2, 1900.

Application filed August 3, 1900- $erial No. 251743- (No specimens.)

To all whom it may concern:

Be it known that LARTHUR D. SOHAEFFER, a citizen of the United States,residing at Hartford City,in the county of Blackford and State of Indiana, have invented certain new and useful Improvements in Processes of Making \Vood-Pulp, of which the following is a specification.

In the manufacture of wood-pulp in the art of paper makinga portion of the wood is treated chemically, with the efiect that the fibers are loosened and the adhesive substance destroyed or removed. A portion is ground on a stone. Afterward in producing the pulp from which the paper is made the two products are mixed together. This involves considerable labor and expense, which it is the purpose of my invention to eliminate.

In my improved process I take the logs of wood and subject them to the action of proper chemical solvents with or without pressure or heat (the process can be hastened with pressure) in an open or inclosed vessel until the outer portion of the wood, from which the bark has been removed, is in the desired condition. I then subject the log of wood in this condition to the grinding process, and thus, as illustrated in the accompanying drawing, cause the grindstone to act both upon the chemically-treated and the untreated portions of the wood at one time, thus mixing them together as the grinding progresses and producing the desired quality of pulp Without further manipulation.

The drawing is merely a diagram matic view of a grindstone S and a log of wood W as the same appear when in contact with each other during the progress of the grinder. The outer portion of the log of wood is, by means of stipple shading, illustrated as having been chemically treated, while the inner portion is represented as being untreated, or substantially so.

Both the chemical treatment and the grinding operation being thoroughly well understood by all skilled in the art, it is deemed unnecessary to further illustrate or describe these operations.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

That process of making wood-pulp which consists in subjecting the piece of wood to chemical treatment until the outer portion thereof is in the desired condition, while the inner portion remains substantially unchanged, and then subjecting the log so treated to the ordinary grinding process, substantially as and for the purpose set forth.

In witness whereof I have hereunto set my hand and seal, at Hartford City, Indiana, this 28th day of July, A. D. 1900.

ARTHUR. D. SCHAEFFER. [L.S.]

Witnesses:

LEVIN O. COTTOM, FRANK A. LYON. 

